“In the construction of this camp, the Romans pursued their usual method of security in building, and practised their favourite military architecture. It formed an irregular parallelogram, the parallel sides of which were equally right lines, and equally long, but the corners were rounded. Those camps which were one third longer than they were broad, were esteemed the most beautiful; but here the proportion is as two to one. “The principal wall of this station, in which is placed the Porta Prætoria, is that to the east, 14 feet high, 214 yards long, and 9 feet broad; the north and southern walls are just the same height and breadth, and just half the length; the western side has no remains of any wall, nor can we determine, with certainty, whether it ever had any; the sea might, possibly, be considered as a sufficient barrier on that side, and the steepness of the hill, as a collateral security. Four massive round towers defend the eastern wall; the northern has one; and another, now thrown down, stood opposite on the southern. These towers were added after building the walls, and served not only to ornament and strengthen them, but as turres exploratorii; each having on the top a round hole two feet deep, and as many in diameter, evidently designed both for the erection of standards and signals, and for the admission of light temporary watch-towers, under the care, and for the use of the speculatores. The south-west corner of the station forms the pretorium, raised by the earth taken out of a vallum which surrounds and secures it, and which is sunk eight feet lower than the common surface of the area. Near this was placed the south tower, which being undermined some years since, by the force of the water running down the vallum after some very heavy rains, is fallen on one side near its former situation, but remains perfectly entire. The north tower having met with a similar accident, is reclined from the wall at the top about six feet, has drawn a part of it, and caused a breach near it. The whole area of the station contains four acres and two roods; and including the walls, five acres, two roods, and twenty perches.